import java.util.ArrayList;
import java.util.*;
import java.util.Random;
public class Practice {
    Random ran = new Random();
    private String sym,Ti="";
    private int num,trues=0;
    private List<String > list,list1,list2;
    public Practice(){
        list = new ArrayList<String>();
        list1 = new ArrayList<String>();
        list2 = new ArrayList<String>();
    }

    public void Ti(int number,int many){
        many = Ticlass(many);
        for (int j=0;j<number;j++) {
            String ti="";
            for (int i = 0; i < many; i++) {
                int A = ran.nextInt(20)+1;
                int D = ran.nextInt(20)+1;
                int B = ran.nextInt(5);
                int C = ran.nextInt(5);
                RationalNumber si = new RationalNumber(A,D);
                if (parity(i)) {
                    if(list1.indexOf("( ")==-1)
                        list1.add(getSym() + " ");
                    else if (list1.size()-list1.lastIndexOf("( ")>4 ) {
                        if(list1.lastIndexOf(") ")-list1.lastIndexOf("( ")<0 && B == 0){
                            list1.add(") ");
                            list1.add(getSym() + " ");
                        }else list1.add(getSym() + " ");
                    }else list1.add(getSym() + " ");
                }
                else if(i==many-1){
                    if(list1.lastIndexOf("( ")-list1.lastIndexOf(") ")>0) {
                        if(C==0) {
                            list1.add(si.toString() + " ");
                            list1.add(" ");
                        }else {
                            list1.add(A + " ");
                            list1.add(") ");
                        }
                    }
                    else if (C!=0)
                        list1.add(A + " ");
                    else list1.add(si.toString() + " ");
                }else if(i==0){
                    if (C!=0)
                        list1.add(A + " ");
                    else list1.add(si.toString() + " ");
                } else if (list1.lastIndexOf(") ")!=-1 ) {
                    if (list1.lastIndexOf(") ") - list1.lastIndexOf("( ") > 0 && B == 0) {
                        list1.add("( ");
                        if (C != 0)
                            list1.add(A + " ");
                        else list1.add(si.toString() + " ");
                    } else if (C != 0)
                        list1.add(A + " ");
                    else list1.add(si.toString() + " ");
                } else if(list1.indexOf("( ")==-1 && B==0) {
                    list1.add("( ");
                    if (C!=0)
                        list1.add(A + " ");
                    else list1.add(si.toString() + " ");
                }else if (C!=0)
                    list1.add(A + " ");
                else list1.add(si.toString() + " ");
            }
            for(String i:list1)
                ti += i;
            list1.clear();
            list.add(ti);
        }
    }

    public void show(){
        Original ori = new Original();
        Counts coun = new Counts();
        Scanner scan = new Scanner(System.in);
        ListIterator<String> li = list.listIterator();
        while (li.hasNext()){
            String A = li.next();
            li.remove();
            ori.evaluate(A);
            String result = coun.evaluate(ori.getMessage());

            System.out.print(A + " =");
            String B = scan.next();
            if(result.equals(B)){
                System.out.println("正确！");
                trues++;
            }else {
                System.out.printf("错误！");
                System.out.println("正确答案为：" + result);
            }
        }
    }

    public int getTrues(){
        return trues;
    }

    public String getSym(){
        int A = ran.nextInt(4);
        switch (A){
            case 0:
                sym = "+";
                break;
            case 1:
                sym = "-";
                break;
            case 2:
                sym = "*";
                break;
            case 3:
                sym = "/";
                break;
        }
        return sym;
    }

    public boolean parity(int num){
        if(num%2==1)
            return true;
        else
            return false;
    }

    public int Ticlass(int many){
        int A = 1;
        for (int i=0;i<many;i++) {
            A += 2;
        }
        return A;
    }

    private boolean isOperator (String token)
    {
        return ( token.equals("*") || token.equals("/") ||
                token.equals("+") || token.equals("-"));
    }
}